<!--
 * @Descripttion: 文件导出
 * @version: 1.1
 * @Author: sakuya
 * @Date: 2022年5月24日16:20:12
 * @LastEditors: sakuya
 * @LastEditTime: 2022年6月13日17:32:05
-->

<template>
	<slot :open="open">
		<el-button type="primary" plain @click="open">导出</el-button>
	</slot>
	<el-drawer v-model="dialog" title="导出" :size="400" direction="rtl" append-to-body destroy-on-close>
		<el-main style="padding: 0 20px 20px 20px;">
			<div v-loading="downLoading" element-loading-text="正在处理中...">
				<div v-if="downLoading && progress"
					style="position: absolute;width: 100%;height: 100%;display: flex;justify-content: center;align-items: center;z-index: 3000;">
					<el-progress :text-inside="true" :stroke-width="20" :percentage="downLoadProgress"
						style="width: 100%;margin-bottom: 120px;" />
				</div>
				<el-tabs>
					<el-tab-pane label="常规" lazy>
						<el-form label-width="100px" label-position="left" style="margin: 10px 0 20px 0;">
							<el-form-item label="文件名">
								<el-input v-model="formData.fileName" placeholder="请输入文件名" />
							</el-form-item>
							<el-form-item label="文件类型">
								<el-select v-model="formData.fileType" placeholder="请选择文件类型">
									<el-option v-for="item in fileTypes" :key="item" :label="'*.'+item" :value="item" />
								</el-select>
							</el-form-item>
							<slot name="form" :formData="formData"></slot>
						</el-form>
						<el-button v-if="async" type="primary" size="large" icon="el-icon-plus" style="width: 100%;"
							@click="download" :loading="asyncLoading">发起导出任务</el-button>
						<el-button v-else type="primary" size="large" icon="el-icon-download" style="width: 100%;"
							@click="download">下 载</el-button>
					</el-tab-pane>
					<el-tab-pane label="列设置" v-if="columnData.length>0" lazy>
						<columnSet :column="columnData"></columnSet>
					</el-tab-pane>
					<el-tab-pane label="其他参数" v-if="data && showData" lazy>
						<el-descriptions :column="1" border size="small">
							<el-descriptions-item v-for=" (val, key) in data" :key="key"
								:label="key">{{val}}</el-descriptions-item>
						</el-descriptions>
					</el-tab-pane>
				</el-tabs>
			</div>
		</el-main>

	</el-drawer>
</template>

<script>
	import columnSet from './column'
	import tool from '@/utils/tool'

	export default {
		components: {
			columnSet
		},
		props: {
			apiObj: {
				type: Object,
				default: () => {}
			},
			fileName: {
				type: String,
				default: ""
			},
			fileTypes: {
				type: Array,
				default: () => ['xlsx']
			},
			data: {
				type: Object,
				default: () => {}
			},
			showData: {
				type: Boolean,
				default: false
			},
			async: {
				type: Boolean,
				default: false
			},
			column: {
				type: Array,
				default: () => []
			},
			blob: {
				type: Boolean,
				default: false
			},
			progress: {
				type: Boolean,
				default: true
			}
		},
		data() {
			return {
				dialog: false,
				formData: {
					fileName: this.fileName,
					fileType: this.fileTypes[0]
				},
				columnData: [],
				downLoading: false,
				downLoadProgress: 0,
				asyncLoading: false
			}
		},
		watch: {
			'formData.fileType'(val) {
				if (this.formData.fileName.includes(".")) {
					this.formData.fileName = this.formData.fileName.substring(0, this.formData.fileName.lastIndexOf('.')) +
						"." + val
				} else {
					this.formData.fileName = this.formData.fileName + "." + val
				}
			}
		},
		mounted() {

		},
		methods: {
			open() {
				this.dialog = true
				this.formData = {
					fileName: (this.fileName ? this.fileName : (new Date().getTime() + '')) + "." + this.fileTypes[0],
					fileType: this.fileTypes[0]
				}
				this.columnData = JSON.parse(JSON.stringify(this.column))
			},
			close() {
				this.dialog = false
			},
			download() {
				let columnArr = {
					column: this.columnData.filter(n => !n.hide).map(n => n.prop).join(",")
				}
				let assignData = {
					...this.data,
					...this.formData,
					...columnArr,
					...{
						token: tool.cookie.get("TOKEN")
					}
				}
				if (this.async) {
					this.asyncDownload(this.apiObj, this.formData.fileName, assignData)
				} else if (this.blob) {
					this.downloadFile(this.apiObj, this.formData.fileName, assignData)
				} else {
					this.linkFile(this.apiObj.url, this.formData.fileName, assignData)
				}
			},
			linkFile(url, fileName, data = {}) {
				let a = document.createElement("a")
				a.style = "display: none"
				a.target = "_blank"
				a.target = "_self"
				//a.download = fileName
				a.href = url + this.toQueryString(data)
				document.body.appendChild(a)
				a.click()
				document.body.removeChild(a)
			},
			downloadFile(apiObj, fileName, data = {}) {
				this.downLoading = true
				var _this = this
				apiObj.get(data, {
					responseType: 'blob',
					onDownloadProgress(e) {
						if (e.lengthComputable) {
							_this.downLoadProgress = parseInt(e.loaded / e.total * 100)
						}
					}
				}).then(res => {
					this.downLoading = false
					this.downLoadProgress = 0
					let url = URL.createObjectURL(res)
					let a = document.createElement("a")
					a.style = "display: none"
					a.target = "_blank"
					a.download = fileName
					a.href = url
					document.body.appendChild(a)
					a.click()
					document.body.removeChild(a)
					URL.revokeObjectURL(url)
				}).catch(err => {
					this.downLoading = false
					this.downLoadProgress = 0
					this.$notify.error({
						title: '下载文件失败',
						message: err
					})
				})
			},
			asyncDownload(apiObj, fileName, data = {}) {
				this.asyncLoading = true
				apiObj.get(data).then(res => {
					this.asyncLoading = false
					if (res.code == 0) {
						this.dialog = false
						this.$msgbox({
							title: "成功发起任务",
							message: `<div><img style="height:200px" src="img/tasks-example.png"/></div><p>已成功发起导出任务，您可以操作其他事务</p><p>稍后可在 <b>任务中心</b> 查看执行结果</p>`,
							type: "success",
							confirmButtonText: "知道了",
							dangerouslyUseHTMLString: true,
							center: true
						}).catch(() => {})
					} else {
						this.$alert(res.message || "未知错误", "发起任务失败", {
							type: "error",
							center: true
						}).catch(() => {})
					}
				}).catch(() => {
					this.asyncLoading = false
				})
			},
			toQueryString(obj) {
				let arr = []
				for (var k in obj) {
					arr.push(`${k}=${obj[k]}`)
				}
				return (arr.length > 0 ? "?" : "") + arr.join('&')
			}
		}
	}
</script>

<style>

</style>
